配置文件中设置的$ _GLOBAL变量未正确读取

Question

this might be a stupid question but I'm stuck here at this silly problem for the part 2 hours.

I have this function which checks if a particular config file's variable are not empty. Here's the function :-

include 'inc.config.php';
function not_valid_settings()
{
    if((empty($_GLOBAL['id'])) || (empty($_GLOBAL['username'])) || empty($_GLOBAL['password']))
    {
        return true;
    }
    else
    {
        return false;
    }
}

Here's the config inc.config.php file:

$_GLOBAL=array();
$_GLOBAL['id'] = "asas";
$_GLOBAL['username'] = "asas";
$_GLOBAL['password'] = 'as';

Function Calling

include 'inc/inc.functions.php';
if(not_valid_settings())
{
    echo "Please enter correct entries in inc/inc.config.php";
    exit();
}

For some reason, I always get the Please enter correct details. Even if my $_GLOBAL['username']='';. What wrong am I doing here?

Answer 1

The problem is that $_GLOBAL appears to be a PHP superglobal, but it is not -- there is no such superglobal in PHP. As a result, this variable is not immediately accessible everywhere. If you add global $_GLOBAL; as the first line if your function, your code should work:

function not_valid_settings()
{
    global $_GLOBAL;

Perhaps you meant to use $GLOBALS instead, though I would strongly advise against it. Use a name like $SETTINGS instead, and don't forget to use global $SETTINGS; in functions where you need to access the settings object.

In general, you should avoid choosing variable names that start with $_ unless they are PHP superglobals; this prefix implies a superglobal, while your variable is not. This will create unnecessary confusion.